Abductor Pollicis Longus

Abductor Pollicis Longus The structure indicated is the abductor pollicis longus muscle of the posterior forearm. The abductor pollicis longus muscle is one of the muscles located in the deep layer of muscles in the posterior compartment of the forearm. There are 5 muscles in the deep layer of the posterior forearm: Supinator Abductor pollicis longus Extensor pollicis brevis Extensor pollicis longus Extensor indicis The abductor pollicis longus muscle, as the name suggests abducts the thumb. Origin: Posterior surface of proximal ulna, radius and interosseous membrane Insertion: Base of 1st metacarpal Innervation: Posterior interosseous nerve Action: Abduction and extension of …

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